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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
//
// System calls for riscv64, Linux
//
// func Syscall(trap int64, a1, a2, a3 int64) (r1, r2, err int64)
TEXT ·Syscall(SB),NOSPLIT,$0-56
CALL runtime·entersyscall(SB)
MOV a1+8(FP), A0
MOV a2+16(FP), A1
MOV a3+24(FP), A2
MOV trap+0(FP), A7 // syscall entry
ECALL
MOV $-4096, T0
BLTU T0, A0, err
MOV A0, r1+32(FP) // r1
MOV A1, r2+40(FP) // r2
MOV ZERO, err+48(FP) // errno
CALL runtime·exitsyscall(SB)
RET
err:
MOV $-1, T0
MOV T0, r1+32(FP) // r1
MOV ZERO, r2+40(FP) // r2
SUB A0, ZERO, A0
MOV A0, err+48(FP) // errno
CALL runtime·exitsyscall(SB)
RET
// func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
TEXT ·Syscall6(SB),NOSPLIT,$0-80
CALL runtime·entersyscall(SB)
MOV a1+8(FP), A0
MOV a2+16(FP), A1
MOV a3+24(FP), A2
MOV a4+32(FP), A3
MOV a5+40(FP), A4
MOV a6+48(FP), A5
MOV trap+0(FP), A7 // syscall entry
ECALL
MOV $-4096, T0
BLTU T0, A0, err
MOV A0, r1+56(FP) // r1
MOV A1, r2+64(FP) // r2
MOV ZERO, err+72(FP) // errno
CALL runtime·exitsyscall(SB)
RET
err:
MOV $-1, T0
MOV T0, r1+56(FP) // r1
MOV ZERO, r2+64(FP) // r2
SUB A0, ZERO, A0
MOV A0, err+72(FP) // errno
CALL runtime·exitsyscall(SB)
RET
// func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
MOV a1+8(FP), A0
MOV a2+16(FP), A1
MOV a3+24(FP), A2
MOV trap+0(FP), A7 // syscall entry
ECALL
MOV $-4096, T0
BLTU T0, A0, err
MOV A0, r1+32(FP) // r1
MOV A1, r2+40(FP) // r2
MOV ZERO, err+48(FP) // errno
RET
err:
MOV $-1, T0
MOV T0, r1+32(FP) // r1
MOV ZERO, r2+40(FP) // r2
SUB A0, ZERO, A0
MOV A0, err+48(FP) // errno
RET
// func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
MOV a1+8(FP), A0
MOV a2+16(FP), A1
MOV a3+24(FP), A2
MOV a4+32(FP), A3
MOV a5+40(FP), A4
MOV a6+48(FP), A5
MOV trap+0(FP), A7 // syscall entry
ECALL
MOV $-4096, T0
BLTU T0, A0, err
MOV A0, r1+56(FP) // r1
MOV A1, r2+64(FP) // r2
MOV ZERO, err+72(FP) // errno
RET
err:
MOV $-1, T0
MOV T0, r1+56(FP) // r1
MOV ZERO, r2+64(FP) // r2
SUB A0, ZERO, A0
MOV A0, err+72(FP) // errno
RET
// func rawVforkSyscall(trap, a1 uintptr) (r1, err uintptr)
TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-32
MOV a1+8(FP), A0
MOV ZERO, A1
MOV ZERO, A2
MOV ZERO, A3
MOV ZERO, A4
MOV ZERO, A5
MOV trap+0(FP), A7 // syscall entry
ECALL
MOV $-4096, T0
BLTU T0, A0, err
MOV A0, r1+16(FP) // r1
MOV ZERO, err+24(FP) // errno
RET
err:
MOV $-1, T0
MOV T0, r1+16(FP) // r1
SUB A0, ZERO, A0
MOV A0, err+24(FP) // errno
RET
TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-48
MOV a1+8(FP), A0
MOV a2+16(FP), A1
MOV a3+24(FP), A2
MOV trap+0(FP), A7 // syscall entry
ECALL
MOV A0, r1+32(FP)
MOV A1, r2+40(FP)
RET
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